docs: def purge(self):
          """ Delete PARTIAL data files and remove torrent from client.
          """
          def partial_file(item):
              "Filter out partial files"
              #print "???", repr(item)
              return item.completed_chunks < item.size_chunks
  
          self.cull(file_filter=partial_file, attrs=["get_completed_chunks", "get_size_chunks"])